Description
CAT 620-5050 Roller Bearing
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The CAT 620-5050 is a Caterpillar genuine single-row cylindrical roller bearing, suitable for the gearboxes or drive axles of loaders/excavators, used for radial support and stable torque transmission under heavy-duty conditions. The following are raw specifications and do not include replacement parts information.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes
Model 620-5050, Type: Single-row cylindrical roller bearing (with stamped cage), Material: High carbon chromium bearing steel (GCr15), Weight: 3.8 kg, Operating Temperature: -40℃ to +120℃, Rated Dynamic Load: 255 kN, Rated Static Load: 240 kN, Limiting Speed: 2800 rpm, Coefficient of Friction: ≤0.002 (oil film condition), Corrosion Resistance: IP65, Service Life: ≥8000 hours, Suitable Radial Load: ≤255 kN, No Axial Load Capacity
Key Dimensions
Inner Diameter: 100 mm (Tolerance H7 +0.030/0 mm), Outer Diameter: 160 mm (Tolerance g6 0/-0.035 mm), Width: 38 mm (Tolerance ±0.15 mm), Roller Diameter: 15 mm, Cage Material: SPCC + galvanized surface, Bearing Clearance: C3 (0.022-0.048 mm), chamfer 2×45°, coaxiality ≤0.02 mm, radial runout ≤0.03 mm, mounting hole diameter 160 mm (H8 tolerance + 0.054/0 mm)
Compatible Models and Parts: Compatible with the gearbox output shaft or drive axle differential of Cat 950K/966K loaders and 320GC/323GC excavators, 2 pieces per unit (symmetrical installation), matching 620-5051 bearing housing and 620-5052 sealing ring, compatible with Cat’s dedicated gear oil lubrication system.
Performance Parameters: Ring/roller hardness HRC 60-64, tensile strength ≥1800 MPa, elastic modulus 207 GPa, linear expansion coefficient 12×10⁻⁶/℃, lubrication method oil bath lubrication, oil film thickness ≥0.02 mm. mm, fatigue life ≥1.0×10⁶ cycles, wear rate ≤0.002 mm/1000 hours
Structural and Performance Advantages
Cylindrical roller structure: line contact load bearing, high radial stiffness, suitable for heavy load and impact conditions; cage separates the rollers, reducing friction and wear, and improving transmission efficiency.
C3 clearance configuration: adapts to changes in operating temperature, avoids thermal expansion and jamming, ensures high-speed rotation flexibility, and reduces vibration and heat generation.
Precision tolerance control: inner diameter H7, outer diameter g6 tolerance, coaxiality ≤0.02 mm, ensuring installation accuracy and operational stability, and reducing the risk of off-center loading.
Installation and Maintenance Points (Original Data)
Installation: Clean the journal and bearing housing (free of oil stains and burrs), cold press installation (pressure ≤95 kN), radial runout ≤0.03 mm after installation, maintain clearance within the C3 range, oil hole alignment deviation ≤0.5 mm, hot installation is prohibited (>80℃ affects bearing steel microstructure). Maintenance: Check bearing temperature every 1000 hours (≤85℃), oil cleanliness every 1500 hours (NAS Class 10 or below), and radial clearance every 2000 hours (>0.1 mm requires replacement). Avoid overload (≤120% of rated load). Use Cat-specific gear oil.
Troubleshooting: Abnormal noise is often due to insufficient lubrication or roller damage, requiring inspection of the lubrication system or replacement of the bearing; excessive temperature is often due to insufficient clearance, requiring adjustment or replacement; excessive vibration is often due to coaxiality deviation, requiring checking installation accuracy.
